Disclosed are: a yellow dye which has a color phase having a high contrast ratio suitable for inkjet recording, can produce recorded materials having high durability, and can be used for the preparation of an ink composition to provide an ink composition having excellent storage stability; and an ink composition containing the yellow dye. A processing element is the physical hardware. Also disclosed are methods of using such compounds in the treatment of hyperproliferative diseases in mammals and pharmaceutical compositions containing such compounds.